For the inverted flight problem I'd first take a look at your clunk. Is it stuck at the bottom of the tank and not getting fuel when you go inverted?
If you are running that far after touchdown it seems to me that you are landing too fast or the idle is way too high. It should be somehwere around 2000-2200 rpm. (lower is better) I would suggest the Master Airscrew or APC type props. They should last you a little longer. Just my two cents worth, hope it helps.